Paint for protecting metals from rusting.



UNITED STATES PATENT OFFICE.

HEINRICH GRNNWALD, 0E GBIESBOBN, NEAR BOUS-ON-THE-SAAR, GERMANY.

PAINT FOR PROTECTING METALS FROM RUSTING.

No Drawing.

To all whom it may concern Be it known that I, HEINRICH GRiiNWALD, a subject of the King of Bavaria, residing at No. 218 Griesborn, near Bous-on-the-Saar, Germany, have invented a certain new and useful Paint for Protecting Metals from Rusting; and I do hereby declare the following to be a full, clear, and exact description of the invention.

The present invention relates to the art of rust proofing metals and consists in the preparation of an improved rust proofing composition.

The fact that oils, such as linseed oil, rape-seed oil, etc., when combined at suitable temperatures with sulfur, yield certain roducts of condensation, is well known.

hlorid of sulfur serves equally as well as sulfur and the term sulfur is used hereinafter and in the claims in a sense broad enough to include such a compound. Also other oils, vegetable as well as animal ones yield on treatment with sulfur or chlorid of sulfur at suitable temperatures, similar products of condensation. Depending upon the proportions of the reagents entering into the mixture and upon the temperature at which the reaction is carried out, products are obtained which vary all the way from syrupy consistency to brittle masses.

Products of a tough, rubber-like character may be obtained, if an oil such as linseed oil, or a mixture of the same with resin, is heated to a temperature from 170 C. to 200 C. and while at this temperature sulfur is added little by little until the mixture is of such consistency that it can be drawn out into threads that do not readily break. On cooling, this product discloses physical properties closely approaching those of rubber.

Through extended researches which have resulted in the present discovery, it has been found that these masses or mixtures of the same with asphalt, pitch tar or other substances which are useful for rust proofing metals, when applied in suitable manner to metal surfaces, adhere extremely firmly thereto, stretch with the same without cracking when the metal expands or contracts by Specification of Letters Patent.

Patented Apr. 11, 1916.

reason of temperature change, protect the metal against moisture, insulate it against the action of electric currents and forms an eflicient protection against erosion and like mechanical Wear upon the surface.

The following example serves to illustrate the invention: One hundred (100) parts by Weight of linseed oil is mixed with one hundred parts (100) by weight of American resin, during agitation and in the presence of heat. When the temperature of the mixture has reached from 170 C. to 200 (3., small portions of sulfur are added gradually until'a sample taken from the mass, draws out to a thread. When this condition has been attained,-the temperature being such that it may serve to melt the added ingredients,one hundred (100) parts tar 011 are added or some other solvent such as a low boiling fraction of raw petroleum, carbon tetrachlorid, carbon bisulfid, benzol, etc. To this are added five hundred (500) parts of coke oven tar (free from water) and the metalobjects, such as iron pipes, then dipped therein. Upon cooling, the objects are found to be covered with an extremely adherent protective coating possessing the characteristics above mentioned. It is pos-.

sible furthermore to dissolve the above described sulfur-oil-resin mixture after it has cooled to 100 C., in varnish or in one of the other abovementioned thin fluid solvents and add thereto a solution of one hundred (100) parts asphalt in one hundred (100) parts varnish. This preparation may be applied cold to the metal, and upon the evaporation of the solvent leaves a protec-' tive covering having the same characteristics as that first described.

I claim:

1. A paint for protecting metals from rusting, comprising a solution of the condensation products of oil, resin and sulfur, which condensation products are capable, at a suitable temperature, of being drawn out to threads, such solution being intimately intermixed with a tarry liquid.

2. A paint for protecting metals from rusting, comprising a solution of the condensation products of oil, resin and sulfur,

to threads, such solution being intimately I intermixed with a tarry liquid consisting of 5 a solution of asphalt in an equal part of varnish.

In testimony whereof I have signed my which condensation products are capable, at name to this specification in the presence of a suitable temperature, of being drawn out two subscribing w tnesses.

HEINRICH GRI'INWALD.

Witnesses:

FRITZ MOLIBQR, CARL DRAPPER. 

